It sounds as if you are both having a difficult time and understandably it is difficult to offer support to each other when you are overwhelmed by what is happening to you, I think to seek support from each other at this time is not going to avhieve anything, deal with each day as it comes become more self reliant and lower your expectations and demands of each other.
The fact that your marriage is in difficulty is very worrying if the marriage is basically good seperation may not improve your situation but make it much worse, would it be possible to take a break to have time to consider your situation and take the heat out of the situation. If you are depressed is it being managed properly would it be possible to speak to your GP, I hope things improve for you